WOOD RESEARCH Volume 66, Number 6, 2021
Petr Kuklík, Zdeněk Prošek, and Anna Gregorová

Comprehensive approach to ensure durabilty of external wooden structures

The article deals with durability of wood, durability of wooden structures and surface modification of wood. We are trying to eliminate the factors causing degradation of wood with the use of photocatalytic materials. Those materials are efficient UV absorbers and they are able to destroy biological aggressors also. The planar particles of titanium oxide TiO2 were chosen for the purpose of our research and applied on a wooden surface. In our case, we used a water solution of TiO2. The main goal of our work was to study the interaction between planar particles of TiO2 and wood matter. The samples of pine wood (Pinus sylvestris) were monitored for 255 days and subsequently evaluated using an electron microscope. The use of TiO2 was compared with reference material and a reference commercial coating.

WOOD RESEARCH Volume 61, Number 2, 2016
Monika Terebesyová, Pavla Ryparová, Petr Ptáček, and Petr Kuklík

Fungicide efficacy of nanofibre textiles containing chemical preservatives for protection of wooden materials – preliminary study

The aim of presented work was to verify a possible application of nanofibre polyvinyl alcohol (PVA) textiles doped with commercially available biocides for chemical preservation of wooden materials. Fungicide efficacy of biocides based on Propiconazole, Tebuconazole, IPBC was evaluated on Norway spruce samples (Picea abies Karst. L.) 25 x 25 x 4 mm covered by the nanofibre textiles, against the wood destroying fungus Coniophora puteana during 28 days. Decay resistance of spruce samples with the fungicidally treated layer was valued on the base of weight loss (Δm) criteria. The durability of spruce samples significantly increased after incorporation of fungicides into the nanofibre textiles (Δm from 0.2 to 3.7 %), but the influence of the stabilization process was also reflected.

WOOD RESEARCH Volume 61, Number 1, 2016
Jan Pošta, Petr Ptáček, Robert Jára, Monika Terebesyová, Petr Kuklík, and Jakub Dolejš

Correlations and differences between methods for non-destructive evaluation of timber elements

The aim of this paper is to compare the results of evaluation of mechanical properties of timber by visual assessment, two grading machines, three devices for measuring in-situ and destructive tests. The most important result is the comparison of static and dynamic modulus of elasticity of timber, and further comparison of strength classes obtained by different measuring methods.

WOOD RESEARCH Volume 65, Number 5, 2020
Lukáš Velebil and Petr Kuklík

Strength and stiffness of mechanically jointed CLT panels loaded by shear in plane

This article is focused on research into the racking strength and stiffness of mechanically jointed cross laminated timber shear walls considering the influence of fasteners between the layers of boards on the stiffness of panels. The work includes an experimental analysis and analytical model. The experimental analysis included tests of the shear wall panels, tests of the specimens to determine the stiffness at the joint of the layers and material tests. The analytical model based on the component method allows the determination of the racking strength and horizontal displacement of the shear wall in dependence on the number of layers and the number of fasteners in the joint of layers, parameters of the anchorage to the substructure and applied external load. The outputs of the numerical model and the results of the experiments agree relatively well. The largest relative displacement error is 18%.